Poisonous Plants Research Articles

Acute poisoning with Jatropha curcas in North Eastern Himalayan region – A case series and review of literature

Plant poisoning is one of the common accidental sources of poisoning amongst the villagers and the troops going on long-range patrolling. Seeds of Jatropha curcas a/k/a biodiesel pant mimicking nuts are an uncommon source of poisoning, manifesting as mainly gastrointestinal symptoms and less frequently the other systemic manifestations. Here, we report a case series of two cases of serving soldiers who presented with gastrointestinal symptoms after consumption of seeds of unknown plants mimicking nuts, which was later identified as J. curcas. Both patients had favorable outcomes with syndromic management of the unknown poisoning.

Investigation and Analysis of Poisonous Plants in Landscape Plants of a Residential Area in Hefei

This paper lists the common poisonous flowers and poisonous plants in landscaping, and explains the matters needing attention in landscape design, which should consider their toxicity and functionality in landscape design, and use the design to play the aesthetic feeling of plants in landscape design. In this paper, the methods of field investigation and consulting data were used to investigate the poisonous plants in a residential area of Hefei.The family name, species name, poisonous parts and toxicity of these poisonous plants were listed, and the problems existing in the application of landscape plants in a residential area of Hefei City were discussed and the solutions were put forward.

Cu Concentration in Vegetable-Cultivated Soil: Comparison Between Open Fields and Protected Environments in Brazil

High copper (Cu) concentration in soils used for vegetable production is an agricultural, social and environmental issue. The excess of Cu in soil can cause toxicity in plants, reducing growth and yields. Moreover, Cu can also be absorbed and accumulated in edible organs, increasing risks for human health. This study aimed to compare Cu fractions in soils: (1) non-cultivated, natural soil (NC), (2) soils cultivated with open field crops (FCs) and (3) soils cultivated in controlled environments (CEs). The survey was carried out on 25 sites in Rio Grande do Sul (Southern Brazil), with each site containing the three types of soils described above. From these sites, the four with the highest soil Cu concentrations were selected to compare soluble (Cu-CaCl2), available (Cu-EDTA) and total (Cu-EPA) Cu. Both total and available soil Cu concentration in soil solution, in CE and FC areas were higher than in NC. At sites 23R1 (Oxisol) and 11R1 (Molisol) the soluble and available Cu content was higher in the FC environment than in CEs, and the same was observed for the total Cu content at sites 23R1 (Oxisol) and 9R1 (Molisol). Some FC soils showed total Cu concentrations higher than the limits established by Brazilian environmental legislation, being, as a consequence, potentially contaminated. Soil monitoring and cropping practices must be adopted to reduce the Cu content in soils of vegetable crops in this region.

Supporting the Digital Autonomy of Elders Through LLM Assistance

The internet offers tremendous access to services, social connections, and needed products. However, to those without sufficient experience, engaging with businesses and friends across the internet can be daunting due to the ever present danger of scammers and thieves, to say nothing of the myriad of potential computer viruses. Like a forest rich with both edible and poisonous plants, those familiar with the norms inhabit it safely with ease while newcomers need a guide. However, reliance on a human digital guide can be taxing and often impractical. We propose and pilot a simple but unexplored idea: could an LLM provide the necessary support to help the elderly who are separated by the digital divide safely achieve digital autonomy?

Unveiling Detoxifying Symbiosis and Dietary Influence on the Southern Green Shield Bug Microbiota.

The Southern green shield bug, Nezara viridula, is an invasive piercing and sucking pest insect that feeds on crops and poses a threat to global food production. Insects live in close relationships with microorganisms providing their host with unique capabilities, such as resistance to toxic plant metabolites. In this study, we investigated the resistance to and detoxification of the plant metabolite 3-nitropropionic acid by core and transient members of the N. viridula microbial community. Microbial community members showed a different tolerance to the toxin and we determined that six out of eight strains detoxified 3-nitropropionic acid. Additionally, we determined that 3-nitropropionic acid might interfere with the biosynthesis and transport of L-leucine. Moreover, our study explored the influence of diet on the gut microbial composition of N. viridula, demonstrating that switching to a single-plant diet shifts the abundance of core microbes. In line with this, testing pairwise microbial interactions revealed that core microbiota members support each other and repress the growth of transient microorganisms. With this work, we provide novel insights into the factors shaping the insect gut microbial communities and demonstrate that N. viridula harbours many toxin-degrading bacteria that could support its resistance to plant defences.

Deadly Nightshade (Atropa belladonna) and Other Weed Poisonings in the Pediatric Intensive Care Unit: Analysis of 54 Children.

Atropa belladonna, known as the deadly nightshade, is one of the most poisonous plants in the world. Deadly nightshade poisoning in both children and adults has been rarely reported and is mostly in the form of case reports. The aim of this study was to illuminate the findings of weed poisoning in childhood. Clinical and laboratory findings of 54 children with acute deadly nightshade and other weed poisoning followed in our center between January 2010 and January 2022, were retrospectively reviewed. In the study analyzing 54 children admitted to the pediatric intensive care unit for poisoning, 24 cases (44.4%) were attributed to deadly nightshade, with the remaining cases involving other weed poisonings. The most common symptoms were flushing, vomiting, mydriasis, gibberish, dry mouth, and tachycardia. Three patients required mechanical ventilation. No patient was dead. Patients were categorized into 2 groups: mild/moderate (no encephalopathy, n : 46) and severe poisoning (with encephalopathy, n : 8). The severe poisoning group had a higher incidence of urinary retention, incoherent speech, dry mouth, agitation, lethargy, convulsions, and coma, which led to longer intensive care unit (ICU) stays and an increased need for respiratory support (P < .05). Furthermore, a statistically significant difference was observed between deadly nightshade poisoning and other weed poisonings, particularly in the presence of symptoms such as headache, flushing, mydriasis, incoherent speech, encephalopathy, convulsions, and coma, all of which contributed to extended ICU stays and elevated respiratory support requirements (P < .05). Notably, neostigmine was administered in all cases of deadly nightshade poisoning due to the unavailability of physostigmine. Our findings showed that the first signs and symptoms of acute deadly nightshade and other weed poisoning may be severe in some children, but no death was observed. Meaningless speech, mydriasis, coma, and lachrymation were negative prognostic signs in childhood weed poisoning. We believe that neostigmine may be an alternative for deadly nightshade poisoning in cases when physostigmine is unavailable. Our study highlights the severity of poisonings involving deadly nightshade and other weeds in pediatric patients. Despite the significant clinical manifestations observed, no fatalities were recorded. The findings underscore the importance of early recognition and appropriate management, emphasizing the need for heightened awareness among healthcare professionals and caregivers.

Advances in viticulture via smart phenotyping: current progress and future directions in tackling soil copper accumulation

Modern viticulture faces significant challenges including climate change and increasing crop diseases, necessitating sustainable solutions to reduce fungicide use and mitigate soil health risks, particularly from copper accumulation. Advances in plant phenomics are essential for evaluating and tracking phenotypic traits under environmental stress, aiding in selecting resilient vine varieties. However, current methods are limited, hindering effective integration with genomic data for breeding purposes. Remote sensing technologies provide efficient, non-destructive methods for measuring biophysical and biochemical traits of plants, offering detailed insights into their physiological and nutritional state, surpassing traditional methods. Smart phenotyping is essential for selecting crop varieties with desired traits, such as pathogen-resilient vine varieties, tolerant to altered soil fertility including copper toxicity. Identifying plants with typical copper toxicity symptoms under high soil copper levels is straightforward, but it becomes complex with supra-optimal, already toxic, copper levels common in vineyard soils. This can induce multiple stress responses and interferes with nutrient acquisition, leading to ambiguous visual symptoms. Characterizing resilience to copper toxicity in vine plants via smart phenotyping is feasible by relating smart data with physiological assessments, supported by trained professionals who can identify primary stressors. However, complexities increase with more data sources and uncertainties in symptom interpretations. This suggests that artificial intelligence could be valuable in enhancing decision support in viticulture. While smart technologies, powered by artificial intelligence, provide significant benefits in evaluating traits and response times, the uncertainties in interpreting complex symptoms (e.g., copper toxicity) still highlight the need for human oversight in making final decisions.

GC/MS Analysis, Antimicrobial, Fungicidal Activities and Toxicity of Rosmarinus Officinalis Essential Oil Plant from Algeria

GC/MS Analysis, Antimicrobial, Fungicidal Activities and Toxicity of Rosmarinus Officinalis Essential Oil Plant from Algeria

Effects of SNP, MgSO4, and MgO-NPs foliar application on Spinacia oleracea L. growth and physio-biochemical responses under cadmium stress

The effects of foliar application of sodium nitroprusside (SNP), magnesium sulfate (MgSO4) and magnesium oxide nanoparticles (MgO-NPs) on the growth, physiology, and gas exchange parameters of two varieties of spinach (Spinacia oleracea L.) under cadmium (Cd) stress were examined. The experiment was arranged in a completely randomized design with 72 pots. Two varieties of S. oleracea (Desi Palak & Lahori Palak) were used. Two concentrations of Cd (0 µM and 150 µM) in the form of cadmium chloride (CdCl2) were used. Two levels of SNP (0 ppm and 100 ppm) and two levels for each form of Mg i.e. MgSO4 and MgO-NPs (0 and 200 ppm) were foliar sprayed on plants in control and Cd stress. Both varieties behaved similarly under Cd stress and caused reductions in growth, physiology, gas exchange, water content parameters and inorganic ion uptake. However, the biochemical parameters like relative membrane permeability (RMP), malondialdehyde (MDA), and hydrogen peroxide (H2O2) contents were increased. However, all foliar spray treatments increased growth, physiological and gas exchange parameters, water content and inorganic ion uptake. However, this reduced the MDA, RMP, and H2O2 contents. Desi Palak showed the more positive results under foliar application of MgO-NPs. However, Lahori palak showed more positive results under the SNP + MgO-NP treatment. It is concluded that foliar application of SNP, MgSO4 and MgO-NPs could be an innovative approach to alleviated the heavy metals (Cd) toxicity in crop plants.

S-nitrosoglutathione reductase disfavors cadmium tolerance in shoots of Arabidopsis

S-nitrosoglutathione reductase (GSNOR) is involved in the response to cadmium (Cd) exposure. In this study, the plants of mutant (gsnor1-3) with lossing-function of- and over-expression (GSNOROE5) of GSNOR were used to clear the role of GSNOR in Cd tolerance. GSNOR activity increased through upregulating the expression of the AtGSNOR gene and protein in Arabidopsis thaliana under Cd stress, which attenuated Cd tolerance. Oxidative damage was more serious in GSNOROE5 and was alleviated in gsnor1-3 under Cd stress, compared with Col-0. Induction of GSNOR facilitated H2O2 accumulation but inhibited catalase (CAT) activity in shoots under Cd stress. This phenotype was eliminated by 3-amino-1,2,4-triazole (3-AT), a CAT inhibitor. In addition, the expressions of AtCAT1 and AtCAT2 were down-regulated with increasing GSNOR activity under Cd stress. This suggested that GSNOR was involved in the accumulation of hydrogen peroxide (H2O2) through regulating CAT expression and activity under Cd exposure. Furthermore, Cd tolerance and CAT activity were improved by spraying S-nitrosoglutathione (GSNO) onto the surface of the leaves. The in vitro activity of CAT increased with GSNO concentration until a GSNO/CAT ratio of 2 was reached. Thus, CAT activity was relative to GSNOR through regulating the expression and S-nitrosylation level of proteins. In summary, the Cd-induced promotion of GSNOR activity aggravated Cd toxicity in plants by mediating H2O2 accumulation controlled by CAT.

Rising temperature impacts the trace metal uptake and toxicity in aquatic plants – A case study of Ni and Co in Elodea canadensis Michx

The global warming and environmental pollution are two crucial contemporary concerns. As both are strongly connected with urbanisation and anthropogenic impact on the environment, they often affect the ecosystem simultaneously. Aquatic habitats are particularly susceptible to thermal and chemical pollution. Temperature influences nearly all physical and chemical features of water bodies and trace metals are known for their toxicity to aquatic organisms. However, effects of multiple stressors, cumulative effects as well as response and possible adaptations of organisms are still open questions. Thus, the aim of this study was to characterize the combined effect of temperature and two trace metals (Co and Ni) on the metal bioaccumulation and viability of a model aquatic macrophyte Elodea canadensis Michx. We exposed shoots of E. canadensis to three temperatures and four metal concentrations (together and separately) applied at environmentally relevant levels. Shoot growth and metal concentration in plants were measured after 120 h. Moreover, after 24, 72 and 120 h the changes in leaf cell morphology and viability were analysed. The results showed that metal accumulation was dose-dependent and was not affected by temperature. The growth of plants was not affected by temperature nor metals. On the other hand, the exposure to Co and Ni and the elevated temperature negatively affected cell viability of E. canadensis leaves which manifested by increased permeability of plasma membranes and visible necroses. The greatest damaged leaf areas were determined after 120 h in the highest concentration of both metals and the highest temperature which indicates synergistic impact of trace metals and temperature on performance of macrohydrophytes. The observed phenomena suggest that global warming and/or thermal pollution may have implications for the performance of aquatic macrophytes in chemically polluted waters, their ability to spread and colonize polluted habitats and their suitability in phytoremediation.

An overview of the poisonous plants of Lebanon and their effects.

Poisonous plants are naturally found in the environment and are easily reachable especially by children. These plants pose significant risks ranging from mild or asymptomatic to severe and even life-threatening. Data on poisonous plants of Lebanon is scarce and scattered; therefore, there remains a significant gap in the literature concerning poisonous plants in Lebanon. This study relied on a thorough review of existing literature on poisonous plants of Lebanon and their effects. Based on our experience in the field and on leveraging available data from the literature, a list of important potentially toxic plants in Lebanon was compiled. Toxic plants in Lebanon were categorized based on their chemical properties into groups such as alkaloids; glycosides; proteins, peptides, and lectins; phenols and phenylpropanoids; terpenes and resins; carboxylic acids; and other (uncategorized). The clinical effects of these plants were discussed in detail to provide an overview of the toxicity that they can cause. This study is part of our ongoing work on poisonous plants of Lebanon. It aims to fill a gap pertaining to poisonous plant; it will benefit healthcare workers and the public at the same time. Prompt recognition of plant exposure and their manifestations will allow for better clinical management especially among emergency healthcare workers and professionals. In addition, this review will increase awareness of Lebanese public about the poisonous plants of Lebanon with the ultimate aim to prevent these toxic occurrences from the beginning.

Citric acid-driven cadmium uptake and growth promotion mechanisms in Brassica napus

Citric acid (CA) is well-known for mitigating cadmium (Cd) toxicity in plants. Yet, the underlying mechanisms driving growth promotion, Cd detoxification/tolerance, and enhanced phytoremediation processes remain incompletely understood. This study investigated the effects of CA application (2.5 mM) on Brassica napus grown in Cd-contaminated (30 mg kg−1) growth medium through a controlled pot experiment. Cd exposure alone significantly impaired various plant physiological parameters in B. napus. Whereas CA application significantly (p < 0.05) enhanced physiological attributes, Cd detoxification and tolerance by modulating key genes involved in photosynthesis and Cd transport, including the metal-transporting P1B-type ATPases (Cd/zinc heavy metal-transporting ATPase 1; HMA1) and light-harvesting chlorophyll a/b-binding 3 (LHCB3). Notably, CA application increased Cd accumulation in stems and leaves by 4% and 35%, respectively, enhancing bioconcentration factors (BCF) by 12% in stems and 40% in leaves while reducing root BCF by 10%. This translocation was facilitated by the upregulation of HMA4, HMA2, and plant Cd resistance (PCR2) genes in plant leaves, improving Cd mobility within the plant. Furthermore, CA induced a 34% increase in phytochelatins and a 32% upregulation in metallothioneins, accompanied by a significant reduction in oxidative stress markers, including a 40% decrease in hydrogen peroxide and a 44% decline in malondialdehyde levels in leaves. Enhanced antioxidant enzyme activity and osmolyte accumulation further contributed to improved Cd detoxification/sequestration in leaves, reduced oxidative stress, and improved photosynthetic efficiency, resulting in enhanced plant biomass production and Cd tolerance. Transcriptomic analysis showed that CA treatment substantially influenced the expression of 12,291 differentially expressed genes (DEGs), with 750 common genes consistently downregulated in CK vs Cd treatment group but upregulated in Cd vs Cd-CA treatment group. Additionally, CA modulated 11 DEGs associated with 32 gene ontologies in the citrate pathway under Cd stress, highlighting its targeted regulatory effect on metabolic pathways involved in Cd stress response. This study offers novel insights into the synergistic role of CA in promoting plant growth and regulating Cd uptake in B. napus, highlighting its potential to enhance phytoremediation strategies.

Investigating the Synergistic Effects of Nano-Zinc and Biochar in Mitigating Aluminum Toxicity in Soybeans

Aluminum (Al) toxicity limited root growth by reducing nutrient translocation and promoting reactive oxygen species (ROS) accumulation, particularly in soybean. The endophyte of root could be modified by plant metabolites, which could potentially alter the tolerance to environmental toxicity of plants in acidic-Al soils. To explore how they help soybean mitigate Al toxicity by altering root endophytes, zinc oxide nanoparticles (ZnO NPs) at doses of 0, 30, 60, 90 mg/kg and 2% biochar (BC) were selected as bio modifiers, and Al2(SO4)3 at 19 mg/kg was used to simulate Al toxicity. We analyzed root endophytes and metabolites by high-throughput sequencing and gas chromatography-mass spectrometry (GC-MS). We found that ZnO NPs with BC could bolster soybean resilience against Al toxicity by enriching soil nutrients, activating enzymes, and bolstering antioxidant mechanisms. We also observed that it enriched root endophytic microbial diversity, notably increasing populations of Nakamurella, Aureimonas, Luteimonas, and Sphingomonas. These changes in the endophytes contributed to the improved adaptability of plants to adversity under Al toxicity. This study highlighted the potential of using ZnO NPs and BC as a sustainable approach to combat Al toxicity, emphasizing the intricate interplay between plant physiology and rhizosphere microbial dynamics in mitigating the effects of environmental toxicity.

Rasacharya Pandit Chivukula Satyanarayanasastry: A proponent of Rasa Chikitsa and a distinguished litterateur who enriched Ayurveda through Telugu literature

Abstract Alchemy has two main aspects: Rasa Chikitsa and Rasa Vada. Rasa Chikitsa refers to the therapeutic application of drugs of metal and mineral origin, animal products, and poisonous plant drugs in Ayurveda. On the other hand, Rasa Vada was a branch of chemistry in the Middle Ages concerned with changing base metals into gold and alchemy, which have been around for centuries. Saint Govinda Bhagavatpada, the mentor of Adi Sankaracharya, was a respected practitioner of Rasa Vada and wrote Rasa Hridaya Tantra, considered a pioneering work on Rasa Sastra. Rasacharya Chivukula Satyanarayana Sastry, from Andhra Pradesh, dedicated his life to mastering these two facets and gained notable recognition as a Rasa Vaidya. He was given the esteemed title of Rasacharya, following the footsteps of the renowned scientist Siddha Nagarjuna. Interestingly, no one else in Andhra Pradesh has been given this honor. However, recent discoveries suggest that Sri Bhudev Mookerji was also honored with the title “Rasacharya” for compiling the monumental publication Rasa Jala Nidhi in five volumes. This comprehensive discussion aims to shine a light on the extraordinary life and significant contributions of Rasacharya Sri Chivukula Satyanarayan Sastry, an outstanding figure in Ayurveda.

Reports of tropane alkaloid poisonings and analytical techniques for their determination in food crops and products from 2013 to 2023.

Food safety is crucial to attaining food security and sustainability. Unsafe foods for human and animal consumption lead to product recalls and rejection, negatively impacting the global economy and trade. Similarly, climate change can adversely affect the availability of safe and nutritious food at the table. The changing climatic conditions and global food trade and transport can make the movement of toxic plants possible, resulting in food crops being increasingly invaded by some species of plants that produce toxic secondary metabolites, such as tropane alkaloids (TAs).Datura stramoniumfrom the Solanaceae plant family is an invasive and virulent plant that produces high amounts of two TAs, atropine and scopolamine. Various food poisoning events following accidental or deliberate ingestion of foods contaminated by atropine and scopolamine from seeds ofD. stramoniumhave been recorded in different locations globally. Due to these incidents, regulatory agencies require the development of plant toxin detection methods that can be used in the food chain as early as possible. This systematic review thus focuses on the TA determination techniques in food and feeds published between 2013 and 2023. A particular focus was given to the sample preparation methods, the improvements of each technique claimed, and data to support the performance of each method, especially the ability to measure at or below the maximum level. The review concludes with other technological advancements, including rapid spectroscopy, electrophoresis, and colorimetric methods, as well as the possibility of coupling with smartphones for use in on-farm detection and the challenges in applying them.

Improving the Productivity and Physiological Characteristics of Lettuce Plants Using Spraying Calcium as a Nanofertilizer

Implementing nanofertilizers in cultivation to enhance food security is important and gaining great significance, as they have good properties to improve plant production, phytochemicals, and nutrient efficiency and thereby meet the demands of the increasing world population for food. This work demonstrated the impact of calcium carbonate nanoparticles (Ca-NPs) and Ca bulk at three concentrations (0, 100, and 200 mg L−1) on growth, productivity, photosynthetic pigments, phytochemical content, antioxidant activity enzymes, minerals, toxicity, and genomic DNA of lettuce plants. In this regard, Ca-NPs at a concentration of 200 mg L−1 reinforced the vegetative growth characteristics of lettuce plants, increasing head length by 15.7 and 19.2%, head diameter by 20.3 and 19.9%, head fresh weight by 54.4 and 52.9%, and production per hectare by 54.7 and 52.8% as compared to the control during the two growing seasons. Furthermore, the percentages of total chlorophyll (62.6 and 59.5%), carotenoids (48.4 and 56.5%), total phenolics (63.6 and 65.7%), total indoles (39.4 and 36.4%), vitamin C (39.7 and 39.6%), antioxidant activity (57.8 and 53.7%), nitrogen (70.5 and 67.5%), phosphorus (120 and 110.5%), potassium (33.0 and 33.2%), and calcium (67.14 and 63.2%) were also increased compared with the control during two consecutive growing seasons. Additionally, Ca-NPs and Ca bulk had an impact on the plants’ genomic DNA compared to the control. In addition, lettuce plants treated with Ca-NPs were proven to be nontoxic and safe for humans by using the Microtox 500 analyzer.

PHYTOSOCIOLOGICAL SURVEY IN PASTURE AREAS IMPLANTED WITH GRASSES OF THE GENUS BRACHIARIA IN DIFFERENT RELIEFS

The agricultural sector is essential to the Brazilian economy, contributing 26% of gross revenue in 2021 and 24.8% in 2022. Brazil, the world's largest beef producer, depends on pastures as the main source of feed for its cattle, with Brachiaria grass playing a significant role. role. Inadequate management of these areas often leads to degradation, characterized by the proliferation of weeds, which require intervention. The study was carried out with the objective of carrying out a phytosociological survey in pasture areas at different altitudes to evaluate the floristic composition and identify the forage potential or harmful characteristics of the species present. Phytosociological surveys were carried out in pastures at IFES – Campus Santa Teresa, ES, in two areas with distinct topographic features (hills and plains). The species were identified and classified as palatable, toxic or unpalatable. Sampling occurred during the dry (winter) and rainy (summer) seasons, and species were quantified according to frequency, density and abundance. A total of 47 species distributed in 14 families were identified. The Fabaceae family was the most prevalent, followed by Amaranthaceae and Malvaceae. Alysicarpus vaginalis (IVI 49.06) was dominant in the hillside area (Area A), while Cyperus rotundus (IVI 115.25) stood out in the plain area (Area B). The similarity index between the areas was 26.42%. The study highlighted the diversity of species in Brachiaria pastures, emphasizing the need for targeted management to control unpalatable and toxic plants and, at the same time, optimize forage potential. The low similarity between the areas suggests distinct ecological dynamics.

Utilizing chicken manure incineration ash as a phosphorus and silicon source to mitigate boron absorption in barley grown on boron-contaminated soil

Excessive boron (B) levels in soil can lead to toxicity in plants, impacting their growth and productivity. Effective strategies to reduce B uptake are important for improving crop performance in contaminated soils. This experiment aimed to investigate the effects of chicken manure incineration ash (CMA) and triple superphosphate (TSP) on B uptake in barley plants grown in B-contaminated soil. Before the experiment, the chemical composition and molecular structure of CMA were analyzed using XRF, XRD and SEM. The soil was contaminated with 15 mg kg−1 of B, and both TSP and CMA were applied at rates of 40, 80, and 160 mg kg−1 of phosphorus (P). Neither P source had a significant impact on plant dry weight. However, increasing doses of applied TSP and CMA increased plant P concentration while significantly decreasing B concentration. Particularly with CMA applied at 160 mg kg−1 P dose, plant B concentration decreased to the lowest level of 194 mg kg−1. Increasing P doses led to a slight decrease in plant silicon (Si) concentration. The pH of soil samples taken after the experiment slightly increased with CMA treatments compared to TSP. The available P concentration in soils increased with increasing P doses. The available B concentration decreased with increasing P doses, especially reducing to the lowest level of 2.52 mg kg−1 in soils with a 40 mg kg−1 P, CMA. In conclusion, in addition to the effect of P, the molecular structure of P is also important in reducing B uptake in barley.

Effects of the co-exposure of microplastic/nanoplastic and heavy metal on plants: Using CiteSpace, meta-analysis, and machine learning

Micro/nanoplastics (MNPs) and heavy metals (HMs) coexist worldwide. Existing studies have reported different or even contradictory toxic effects of co-exposure to MNPs and HMs on plants, which may be related to various influencing factors. In this study, existing publications were searched and analyzed using CiteSpace, meta-analysis, and machine learning. CiteSpace analysis showed that this research field was still in the nascent stage, and hotspots in this field included accumulation, cadmium (Cd), growth, and combined toxicity. Meta-analysis revealed the differential association of seven influencing factors (MNP size, pollutant treatment duration, cultivation media, plant species, MNP type, HM concentration, and MNP concentration) and 8 physiological parameters receiving the most attention. Co-exposure of the two contaminants had stronger toxic effects than HM treatment alone, and phytotoxicity was generally enhanced with increasing concentrations and longer exposure durations, especially when using nanoparticles, hydroponic medium, dicotyledons producing stronger toxic effects than microplastics, soil-based medium, and monocotyledons. Dry and fresh weight analysis showed that co-exposure to MNPs and Cd resulted in significant phytotoxicity in all classifications. Concerning the MNP types, polyolefins partially attenuated plant toxicity, but both modified polystyrene (PS) and biodegradable polymers exacerbated joint phytotoxicity. Finally, machine learning was used to fit and predict plant HM concentrations, showing five classifications with an accuracy over 80 %, implying that the polynomial regression model could be used to predict HM content in plants under complex pollution conditions. Overall, this study identifies current knowledge gaps and provides guidance for future research.